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what your looking for in JUNOS land is called an RVI (Routed VLAN Interface) -- basically applies an IP address to a VLAN --
first create the vlan IP: set interfaces vlan unit XYZ family inet address x.x.x.x/y
then associate that interface to your vlan: set vlans ABC l3-interface vlan.XYZ
there is no requirement for the vlan unit to be the same as the vlan-id, but it is best practice to help make troubleshooting and understanding the config easier.
and then since this is an SRX you need to associate that RVI to a security zone, make sure policies allow the proper traffic, etc etc
You will find the free switching and enterprise routing training manuals helpful for the transition. Juniper has the "Fast Track" portal where they have posted the student and lab manuals for both switching and enterprise routing for JUNOS. The switching class covers these features and reviews the concepts and commands.
Fast Track Web Site
There is also a converter application if you know the current sceenos configuration you want to use in JUNOS. You just past the known configuration commands into the window and it gives you the JUNOS equivalent. This is a link off of the main support page and requires a software agreement on the way in.
ScreenOS to JUNOS translator: https://i2j.juniper.net/s2jes/index.jsp